KNF 121416-121419 07/18 Translation of original Operating Instructions, english Keep for future use! Operating Instructions Read and observe these Operating Instructions! Diaphragm Vacuum Pump N920 AP.18 N920 AP.29.18 N920 KT.29.18G KNF Neuberger GmbH Alter Weg 3 D-79112 Freiburg Germany Phone +49-(0)7664 / 5909-0 Fax +49-(0)7664 / 5909-99 E-Mail: [email protected]www.knf.de Contents Page 1. About this document..................................................................3 2. Use ............................................................................................4 3. Safety ........................................................................................5 4. Technical Data ..........................................................................7 5. Design and Function ...............................................................10 6. Installation and connection ......................................................12 7. Operation .................................................................................13 8. Servicing ..................................................................................16 9. Troubleshooting.......................................................................25 10. Spare parts and accessories ...................................................27 11. Returns ....................................................................................28 12. Health and safety clearance and decontamination form .........29
32
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Diaphragm Vacuum Pumps N 920 .18 and N 920 KT.29...troller VC 900 Fig. 2: Design N 920 KT.29.18G Function Diaphragm Pump 1 Outlet valve 2 Inlet valve 3 Transfer chamber 4 Diaphragm
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KNF 121416-121419 07/18 Translation of original Operating Instructions, english Keep for future use!
Operating Instructions Read and observe these Operating Instructions!
1. About this document.................................................................. 3 2. Use ............................................................................................ 4 3. Safety ........................................................................................ 5 4. Technical Data .......................................................................... 7 5. Design and Function ............................................................... 10 6. Installation and connection ...................................................... 12 7. Operation ................................................................................. 13 8. Servicing .................................................................................. 16 9. Troubleshooting ....................................................................... 25 10. Spare parts and accessories ................................................... 27 11. Returns .................................................................................... 28 12. Health and safety clearance and decontamination form ......... 29
Pump Regular inspection for external damage or leaks
Diaphragm and valve plates
Replace at the latest, when pump output decreases
Tab. 7
8.2. Cleaning
When cleaning, make sure that no liquids enter the inside of
the housing.
8.2.1. Flushing Pump
WARNING
Personal injury caused by poisoning or explosion
and damage to the pump When flushing the pump with inert gas, make
sure that the gas ballast valve is closed so no
reactive or explosive mixtures can form.
Before switching off the pump, flush it with air (if neccesary for
safety reasons: with an inert gas) for about five minutes under
atmospheric conditions (ambient pressure).
If inert gas is used:
Connect the inert gas feed to the gas inlet of the pump and
close the gas ballast valve. The safety precautions in Chapter
3 must be observed at all times.
8.2.2. Cleaning Pump
Only use solvents for cleaning if the head materials cannot be
attacked (check the resistance of the material!).
If compressed air is available, blow out the components.
Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G Servicing
Translation of original Operating Instructions, English, KNF 121416-121419 07/18 17
8.3. Changing Diaphragm and Valve Plates 8.3.1. N 920 AP.18 and N 920 AP.29.18
Pump is switched off and mains plug is removed from the
socket
Pump is clean and free of hazardous materials
Tubes removed from pump’s pneumatic inlet and outlet
Spare part/tool
Service Set (according to chapter 10)
Allen key 4 mm
Felt-tip pen
Stabilization diaphragm (if required) Tab. 8
Always replace diaphragm and valve plates together to main-
tain the pump performance.
WARNING
Health hazard due to dangerous substances
in the pump!
Depending on the substance transferred, caustic
burns or poisoning are possible.
Wear protective clothing if necessary, e.g.
protective gloves.
Flush pump before replacing the diaphragm and
valve plates (see chapter 8.2.1).
Conditions
Spare parts/tools
Information on procedure
Servicing Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G
18 Translation of original Operating Instructions, English, KNF 121416-121419 07/18
1 Head cover 2 Screw 3 Intermediate plate, head 1 4 Valve plate 5 O-ring (ø 24 x 2) 6 O-ring (ø 5.5 x 2) 7 Intermediate plate, head 2 8 Intermediate plate, head 3 9 Diaphragm, head 1 10 Diaphragm, head 2 11 Diaphragm, head 3 12 Connecting rod, head 2 13 Connecting rod, head 3 14 Adapter 15 Pump housing 16 Fan 17 Stabilization diaphragm 18 O-ring (ø 5.5 x 2) 19 Screw
Fig. 6: Exploded drawing N 920 AP.18 / N 920 AP.29.18
Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G Servicing
Translation of original Operating Instructions, English, KNF 121416-121419 07/18 19
Remove pump head
1. Undo the nine screws (2) in the head cover (1) and lift the
head cover off the pump housing (15) (see fig. 6).
2. Mark the position of intermediate plate (3) and adapter (14)
relative to each other by a drawing line with a felt-tip pen. This
helps avoid incorrect assembly later.
3. Mark the position of intermediate plate (7) and adapter (14)
relative to each other by two drawing lines with a pencil.
4. Mark the position of intermediate plate (8) and adapter (14)
relative to each other by three drawing lines with a pencil.
5. Lift the intermediate plates (3), (7)and (8) off the adapter.
Change diaphragms
1. Turn the three diaphragms (9), (10) and (11) outwards with
your hands, counter-clockwise. For this, turn the fan (16) such
that you can easily grip each diaphragm with your hands.
For diaphragms (10) and (11):
Make sure the diaphragm spacers being between diaphragm
and connecting rod do not fall into the pump housing.
If diaphragm spacers should adhere to the diaphragms, take
them off and put them on the thread of the corresponding
connecting rod.
The same number of diaphragm spacers must be mounted
as were used for the previous assembly. This is necessary, in
order to ensure the pump's pneumatic performance.
2. Remove the valve plates (4) and O-rings (5) from the interme-
diate plates (3), (7) and (8).
3. Remove O-ring (6) from the intermediate plate (3).
4. Remove O-ring (18) from adapter (14).
Carry out steps 5 to 11 only if the stabilization diaphragm also
shall be changed. 5. Loosen the two screws (19) and remove the adapter (14) from
the pump housing (15).
The stabilization diaphragm (17) is now visible.
6. Remove the existing diaphragm spacers from the stabilization
diaphragm (17).
It is important to later re-install the same quantity of diaphragm
spacers in order to ensure the pump's pneumatic performance. 7. Use the assembly key to loosen the stabilization diaphragm
(17) and then manually screw it out (in the counterclockwise di-
rection).
8. Screw in the new stabilization diaphragm (17) and tighten it
hand-tight with the assembly key.
9. Put spacer(s) onto the thread of the new stabilization dia-
phragm (17) (same number).
Servicing Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G
20 Translation of original Operating Instructions, English, KNF 121416-121419 07/18
10. Place the adapter (14) onto the pump housing (15).
The adapter must be aligned flush with the pump housing (15).
This is important for later installation of the diaphragm (9). 11. Tighten the two screws (19) to hand-tightness.
Begin with the outermost screw and make sure that the adapt-
er (14) does not move while you are tightening the screws. 12. Screw the new diaphragm (9) into the thread of the stabiliza-
tion diaphragm (17) and tighten it by hand.
To ensure proper pump performance, it is important to main-
tain a uniform distance everywhere between the outer edge of
the diaphragm (9) and the adapter (14). If the distance is not
uniform, you must re-loosen the screws (19) and re-align the
adapter so the distance is the same everywhere.
Before you finally tighten the diaphragms, you are recom-
mended to move the diaphragm to the upper dead center by
rotating the fan (16).
13. Screw the new diaphragm (10) and (11) onto the connecting
rods (12) and (13) and tighten it by hand.
Mount valve plates, intermediate plates and head cover
1. Lay the new O-ring (18) on the adapter (14).
2. Lay the new valve plates (fig. 7/4) and the new O-rings (5) on
the intermediate plates (3), (7)and (8).
Upper and lower sides of the valve plates are identical. For
correct position see fig. 6.
3. Lay the new O-ring (6) on the intermediate plate (3).
4. Place the intermediate plates (3), (7)and (8) on the adapter
(14) in the position indicated by the drawing lines.
5. Place the head cover (1) on the pump housing (15); tighten the
screws (2) hand tight, evenly and diagonally.
6. Dispose of the old diaphragms, valve plates and O-rings
properly.
Final steps
1. Reconnect suction and pressure line to the pump.
2. Reconnect the pump to the electricity supply.
If you have any questions about servicing, call your KNF technical
adviser (see last page for contact telephone number).
Fig. 7: Position of valve plates
Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G Servicing
Translation of original Operating Instructions, English, KNF 121416-121419 07/18 21
8.3.2. N 920 KT.29.18G
Pump is switched off and mains plug is removed from the
socket
Pump is clean and free of hazardous materials
Tubes removed from pump’s pneumatic inlet and outlet
Spare part/tool
Service Set (according to chapter 10)
Allen key 4 mm
Phillips-head screwdriver No. 2
Felt-tip pen Tab. 9
Always replace diaphragm and valve plates together to main-
tain the pump performance.
WARNING
Health hazard due to dangerous substances
in the pump!
Depending on the substance transferred, caustic
burns or poisoning are possible.
Wear protective clothing if necessary, e.g.
protective gloves.
Flush pump before replacing the diaphragm and
valve plates (see chapter 8.2.1).
Conditions
Spare parts/tools
Information on procedure
Servicing Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G
22 Translation of original Operating Instructions, English, KNF 121416-121419 07/18
1 Screws of pump handhold 2 Pump handhold 3 Screws of head cover 4 Head cover 5 Cover 6 Screws of cover 7 Screws of head plate 8 Disk spring at screw (7)* 9 Washer at screw (7)* 10 Head plate 11 Intermediate plate 12 O-ring (ø 24 x 2) 13 Valve plate 14 Intermediate plate 15 Intermediate plate 16 Diaphragm 17 Adapter 18 Housing 19 Screws 20 Fan 21 Connecting rod 22 Diaphragm 23 Gas ballast valve * see fig. 10
Fig. 8: Exploded drawing N 920 KT.29.18G
Remove pump head
1. Undo both screws (1) of pump handhold (2); remove pump
handhold (see fig. 8).
2. Undo the nine screws (3) of the head cover (4).
3. Undo two screws (6) each, and remove both covers (5) at head
cover (4).
4. Lift the head cover (4) off the pump housing (18).
5. Lift off head plate (10) with intermediate plates (11), (14) and
(15).
Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G Servicing
Translation of original Operating Instructions, English, KNF 121416-121419 07/18 23
Change diaphragms
1. Turn the diaphragms (16) (2 pieces) and (22) (1 piece) out-
wards with your hands, counterclockwise. For this, turn the fan
(20) such that you can easily grip each diaphragm with your
hands.
Make sure the diaphragm spacers being between diaphragm
and connecting rod (21) do not fall into the pump housing.
If diaphragm spacers should adhere to the diaphragms, take
them off and put them on the thread of the corresponding
connecting rod.
The same number of diaphragm spacers must be mounted
as were used for the previous assembly. This is necessary, in
order to ensure the pump's pneumatic performance.
2. Screw the new diaphragms (16) (2 pieces) and (22) (1 piece)
onto the connecting rods (21) and tighten it by hand.
Before you finally tighten the diaphragm, you are recom-
mended to move the diaphragm to the upper dead center by
rotating the fan (20).
3. Put head plate (10) with intermediate plates (11), (14) and (15)
on adapter (17).
Change valve plates
1. Mark the position of head plate (10) and intermediate plate
(11) relative to each other by a drawing line with a felt-tip pen.
This helps avoid incorrect assembly later.
2. Mark the position of head plate (10) and intermediate plate
(14) relative to each other by two drawing lines with a pencil.
3. Mark the position of head plate (10) and intermediate plate
(15) relative to each other by three drawing lines with a pencil.
4. Undo the three screws (7) in head plate (10) and remove head
plate from intermediate plates (11), (14) and (15).
5. Remove valve plates (13) and O-rings (12) from intermediate
plates (11), (14) and (15).
Instead of lying on intermediate plate, O-rings could stick to
head plate (10).
6. Lay the new valve plates (13) and the new O-rings (12) on the
intermediate plates (11), (14) and (15).
Upper and lower sides of the valve plates are identical. For
correct position see fig. 9.
7. Dispose of the old diaphragms, valve plates and O-rings
properly.
Fig. 9: Position of valve plates
Servicing Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G
24 Translation of original Operating Instructions, English, KNF 121416-121419 07/18
Mount pump head
1. Place head plate (10) on intermediate plates (11), (14) and
(15) in the position indicated by the drawing lines.
At the front edge the three intermediate plates must lie in a
line on which head plate is placed flushly.
2. Tighten the three screws (7) of head plate (10) carefully slightly
hand-tight.
For position and orientation of disk spring (8) and washer (9)
of screw (7) see fig. 10.
3. Place head cover (4) on pump housing (18).
4. Tighten the nine screws (3) of head cover (4) slightly in the first
instance. Start with the screws of medium pump stage, then
tighten the screws on the right, at least these on the left.
5. Now, tighten the screws (3) firmly; tighten the center screws
first, then continue outward.
If the screws are stiff to turn, the intermediate plates do not
lie in a line at front edge, or intermediate plates and head
plate are not placed flushly (see step 1).
6. Remount the covers (5).
7. Remount pump handhold (2).
Final steps
1. Reconnect suction and pressure line to the pump.
2. Reconnect the pump to the electricity supply.
If you have any questions about servicing, call your KNF technical
adviser (see last page for contact telephone number).
Fig. 10: Posit ion and orientat ion
of disk (8) and washer (9) at
screw (7)
Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G Troubleshooting
Translation of original Operating Instructions, English, KNF 121416-121419 07/18 25
9. Troubleshooting
DANGER
Extreme danger from electrical shock!
Disconnect the pump power supply before working
on the pump.
Make sure the pump is de-energized and secure.
Check the pump (see Tab. 10 to 13).
Pump does not transfer
Cause Fault remedy
No voltage in the power source Check room fuse and switch on if necessary.
Thermal switch has operated following to over-heating.
Disconnect pump from mains.
Allow pump to cool.
Trace cause of over-heating and eliminate it.
Connections or lines blocked. Check connections and lines.
Remove blockage.
External valve is closed or filter is clogged.
Check external valves and filters.
Condensate has collected in pump head.
Detach the condensate source from the pump.
Flush pump (see chapter 8.2.1).
Diaphragm or valve plates are worn.
Replace diaphragm and valve plates (see chapter 8.3).
Tab. 10
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause Fault remedy
Condensate has collected in pump head.
Detach the condensate source from the pump.
Flush pump (see chapter 8.2.1).
There is gauge pressure on pressure side and at the same time vacuum or a pressure above atmospheric pressure on suction side.
Change the pressure conditions.
Pneumatic lines or connection parts have an insufficient cross section.
Disconnect pump from system to determine output values.
Eliminate throttling (e.g. valve) if necessary.
Use lines or connection parts with larger cross section if necessary.
Leaks occur on connections, lines or pump head.
Check that tubes sit correctly on hose nozzles.
Replace leaky tubes.
Eliminate leaks.
Connections or lines completely or partially clogged.
Check connections and lines.
Remove the clogging parts and particles.
Head parts are soiled. Clean head components.
Diaphragm or valve plates are worn.
Replace diaphragm and valve plates (see chapter 8.3).
Troubleshooting Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G
26 Translation of original Operating Instructions, English, KNF 121416-121419 07/18
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause Fault remedy
Replaced diaphragms and valve plates
Check that the spacers have been replaced onto the dia-phragm screw thread.
Check head connection and hose connections for leaks.
Possibly carefully tighten the screws of the head cover crosswise.
Gas ballast still open. Close gas ballast. Tab. 11
Pump is switched on, but does not run, the on/off-switch on the pump is not lit
Cause Fault remedy
Pump is not connected with the power source.
Connect pump to mains power.
No voltage in the power source Check room fuse and switch on if necessary.
The pump’s overcurrent protec-tion circuit has responded.
Remove the pump from the source of electrical power.
Determine and eliminate the cause of the overcurrent (e.g. inproper pressure, liquid in the pump heads).
The pump must be unplugged for some seconds before the electronics will allow to restart.
Tab. 12
Pump is switched on, but does not run, the on/off-switch on the pump is lit
Cause Cause
The thermal switch has opened due to overheating
Remove pump´s mains plug from the socket.
Allow pump to cool.
Trace cause of over-heating and elimate it. Tab. 13
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the pump to KNF Customer Service (see last page for the ad-
dress).
1. Flush the pump to free the pump head of dangerous or ag-
gressive gases (see chapter 8.2.1).
2. Clean the pump (see chapter 8.2.2).
3. Send the pump, together with completed Health and Safety
Clearance and Decontamination Form (Chapter 12), to KNF
stating the nature of the transferred medium.
Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G Spare parts and accessories
Translation of original Operating Instructions, English, KNF 121416-121419 07/18 27
10. Spare parts and accessories
10.1. Spare parts
Service Set contains all replacement parts needed for one com-
plete service:
3 diaphragms
6 O-rings (ø 24 x 2)
6 valve plates
Only for N 920 AP.18 and N 920 AP.29.18:
2 O- rings (ø 5.5 x 2)
Tab. 14
10.2. Accessories
Tab. 15
Spare parts Order No.
Service set for N 920 AP.18 057456
Service set for N 920 AP.29.18 057456
Service set for N 920 KT.29.18G 305355
Service set for N 920 KT.29.18 111905
Stabilization diaphragm (only for N 920 AP.18 and N 920 AP.29.18)
056523
Gas ballast valve 136104
Accessories Order No.
Silencer/ Filter G 1/8 007006
Sealing for hose connector 026906
Adjustable delivery through analog signal input; for external control
on request
Assembly key for stabilization diaphragm (only for N 920 AP.18 and N 920 AP.29.18)
116885
Interface cable Vacuum controller – KNF pump (2m)
307757
Interface cable Vacuum controller – KNF pump (5m)
307758
Returns Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G
28 Translation of original Operating Instructions, English, KNF 121416-121419 07/18
11. Returns
Pumps and systems used in laboratories and process-based
industries are exposed to a wide variety of conditions. This means
that the components contacting pumped media could become
contaminated by toxic, radioactive, or otherwise hazardous sub-
stances.
For this reason, customers who send any pumps or systems back
to KNF must submit a Health and safety clearance and decontami-
nation form in order to avoid a hazardous situation for KNF em-
ployees. This Health and safety clearance and decontamination
form provides the following information, among other things:
physiological safety
whether medium-contacting parts have been cleaned
whether the equipment has been decontaminated
media that have been pumped or used
To ensure worker safety, work may not be started on pumps or
systems without a signed Health and safety clearance and decon-
tamination form.
For optimal processing of a return, a copy of this declaration
should be sent in advance via e-mail, regular mail, or fax to KNF
Customer Service (refer to final page for address). In order to avoid
endangering employees who open the shipment's packaging,
despite any residual hazards, the original version of the Health and
safety clearance and decontamination form must accompany the
delivery receipt on the outside of the packing.
The template for the Health and safety clearance and decontami-
nation form is included with these Operating Instructions and may
also be downloaded from the KNF website.
The customer must specify the device type(s) and serial number(s)
in the Health and safety clearance and decontamination form in
order to provide for the unambiguous assignment of the Declara-
tion to the device that is sent to KNF.
In addition to the customer's declaration of physiological safety,
information about operating conditions and the customer's applica-
tion are also of importance to ensure that the return shipment is
handled appropriately. Therefore, the Health and safety clearance
and decontamination form requests this information as well.
Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G Health and safety clearance and decont. form
Translation of original Operating Instructions, English, KNF 121416-121419 07/18 29
12. Health and safety clearance and decon-tamination form
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